Timing here refers to a design consideratiob, e.g. how fast can the clock go before a logic bit at the output of one unit gets misinterpreted as the opposite le

Timing here refers to a design consideratiob, e.g. how fast can the clock go before a logic bit at the output of one unit gets misinterpreted as the opposite level on the input of another unit. That depends on the layout of the design, how many inputs are connected to that output, etc. They don't want to care about timing. Not that they don't care about how fast it runs.